JP6951275B2 - Cooker - Google Patents

Description

The present invention provides a burner for heating an object to be cooked, an ignition means for igniting the burner, a point fire extinguishing operation member operated for igniting and extinguishing the burner, and a source provided in a gas supply path to the burner. The present invention relates to a cooking device including a valve and a gas valve device provided in series with a main valve in a gas supply path.

Conventionally, as a gas valve device provided in this type of cooking cooker, according to Patent Document 1, an operation in which an electromagnetic safety valve, a flow rate control valve, and a stepping motor are driven in the valve casing in the axial direction via an interlocking mechanism. A rod and a valve seat member that is movable in the axial direction are known. In this system, one of the axial directions is the forward direction and the other is the reverse direction, and the electromagnetic safety valve is provided on the valve seat member so as to face the forward direction, and the safety valve valve seat and the safety valve valve seat. Facing safety valve valve body, valve spring that urges the safety valve valve body in the reverse direction to sit on the safety valve valve seat, and suction connected to the safety valve valve body via a valve shaft extending in the forward direction. It is equipped with a piece and an electromagnet facing the suction piece, and the flow control valve is provided to face the valve seat for the control valve and the valve seat for the control valve, which are provided on the valve seat member so as to face the recovery direction. It is equipped with a valve body for a control valve fixed to the operation rod. Further, in the valve casing, a valve seat stopper is provided to stop the movement of the valve seat member in the recovery direction at a predetermined recovery end position where the safety valve valve body can be seated on the safety valve valve seat.

In this product, when the ignition operation is performed by the point fire extinguishing operation member, the stepping motor is rotated in the normal direction to move the operation rod in the forward direction, so that the valve body for the control valve hits the valve seat for the control valve. The valve seat member is brought into contact with the valve seat member in the forward movement direction from the return end position, the safety valve valve seat is brought into contact with the safety valve valve body, and the safety valve valve body is brought into contact with the electromagnet with the suction piece. It is pushed to the position against the urging force of the valve spring, and in this state, the electromagnet is energized to attract and hold the valve body for the safety valve at the valve opening position, then the main valve is opened and then the ignition means is operated. At the same time, the stepping motor is reversed to move the operation rod in the recovery direction, and the safety valve valve seat is separated from the safety valve valve body that is attracted and held at the valve opening position by moving the valve seat member in the recovery direction. Then, the electromagnetic safety valve is opened to start supplying gas to the burner.

By the way, it is difficult to control the stepping motor at the moment when the valve body for the safety valve reaches the valve opening position, that is, at the moment when the suction piece comes into contact with the electromagnet. Then, when the valve body for the safety valve reaches the valve opening position, the stepping motor rotates further in the normal direction, and an excessive force is applied to the contact portion between the suction piece and the electromagnet, and the suction piece is damaged to cause suction failure. May occur. Therefore, the applicant of the present application has previously proposed the following in accordance with Japanese Patent Application No. 2016-14205. In this system, the interlocking mechanism includes a cylindrical cam body concentric with the operation rod, which is rotationally driven by a stepping motor, and a pin fixed to the operation rod, which engages with a spiral cam groove formed in the cam body. It is composed of a cam mechanism that has an operating rod that moves in the forward and backward directions by an axial thrust that acts from the cam groove through a pin in the forward and reverse rotations of the cam body. The cam body is movable in the axial direction, and includes a cam stopper that stops the movement of the cam body in the forward movement direction at a predetermined position, and a cam spring that urges the cam body in the forward movement direction. Then, after the valve body for the safety valve reaches the valve opening position, the cam body resists the urging force of the cam spring from the predetermined position by the axial reaction force acting from the pin through the cam groove in the forward rotation of the stepping motor. I try to move in the direction of recovery. Therefore, the pressing force acting on the operation rod in the forward direction is suppressed to less than the urging force of the cam spring, and an excessive force is not applied to the contact portion between the suction piece and the electromagnet, and the suction piece is damaged and the suction is poor. Can be prevented from occurring.

Here, if the stepping motor is energized when the main valve is opened after the safety valve valve body is attracted to the valve opening position by energizing the electromagnet, the power consumption increases and the voltage of the power supply battery increases. It will be reduced and the battery life will be shortened. Therefore, in the above-mentioned prior application, generally, after the safety valve valve body arrives at the valve opening position, the electromagnet is rotated in the normal direction until the cam body moves from the predetermined position in the recovery direction. It is conceivable that the valve body for the safety valve is attracted and held at the valve opening position by energizing the valve body, and in this state, the energizing of the stepping motor is stopped to open the main valve.

However, since the cam body moves from the predetermined position in the recovery direction against the urging force of the cam spring, when the energization of the stepping motor is stopped while the cam body moves from the predetermined position in the recovery direction, the cam body of the cam spring A rotational force in the reverse direction acts on the stepping motor through the cam groove that comes into contact with the pin due to the urging force. When this rotational force exceeds the detent torque, slippage occurs in the stepping motor, causing a deviation in the correlation between the rotational phase of the stepping motor and the axial position of the operation rod, and a gas flow rate adjustment error by the flow rate control valve. Will occur.

Japanese Unexamined Patent Publication No. 2013-68356

In view of the above points, the present invention is a cooking cooker provided with the gas valve device of the above-mentioned prior application, and when the energization of the stepping motor is stopped when the main valve is opened, slippage occurs in the motor. The challenge is to provide something that is not available.

In order to solve the above problems, the present invention presents a burner for heating an object to be cooked, an ignition means for igniting the burner, a point fire extinguishing operation member operated for igniting and extinguishing the burner, and a gas to the burner. A heating cooker including a main valve interposed in the supply path and a gas valve device interposed in series with the main valve in the gas supply path. The gas valve device has an electromagnetic safety valve in the valve casing. , A flow control valve, an operation rod driven in the axial direction by a stepping motor via an interlocking mechanism, and a valve seat member that can move in the axial direction are provided, and one of the axial directions is the forward direction and the other is the axial direction. The electromagnetic safety valve reverses the safety valve valve seat provided on the valve seat member so as to face the forward movement direction, the safety valve valve body facing the safety valve valve seat, and the safety valve valve body. A valve spring that is urged in the direction to be seated on the valve seat for the safety valve, an suction piece that is connected to the valve body for the safety valve via a valve shaft that extends in the forward direction, and an electromagnet that faces the suction piece are provided to control the flow rate. The valve includes a valve seat for a control valve provided on the valve seat member so as to face the recovery direction, and a valve body for a control valve fixed to an operation rod so as to face the valve seat for the control valve. A valve seat stopper is provided in the casing to stop the movement of the valve seat member in the recovery direction at a predetermined recovery end position where the safety valve valve body can be seated on the safety valve valve seat, and the stepping motor is rotated in the normal direction. By moving the operation rod in the forward movement direction, the valve body for the control valve is brought into contact with the valve seat for the control valve, and the valve seat member is pushed in the forward movement direction from the return end position, and the valve for the safety valve. The safety valve is energized by bringing the seat into contact with the valve body for the safety valve and pushing the valve body for the safety valve against the urging force of the valve spring to the valve opening position where the suction piece abuts on the electromagnet. The valve seat is attracted and held at the valve opening position, and then the stepping motor is reversed to move the operation rod in the recovery direction, thereby moving the valve seat member in the recovery direction and opening the safety valve valve seat. The safety valve valve body that is attracted and held at the position is separated from the valve body to open the electromagnetic safety valve, and the interlocking mechanism is a tubular cam body concentric with the operation rod and a cam body that are rotationally driven by a stepping motor. It has a pin fixed to the operation rod that engages with the spiral cam groove formed in, and the operation rod moves forward by the axial thrust that acts from the cam groove through the pin in the forward and reverse rotation of the cam body. It is composed of a cam mechanism that moves in the direction and the return direction, and the cam body is movable in the axial direction, and has a cam stopper that stops the movement of the cam body in the forward movement direction at a predetermined position, and a cam. It is equipped with a cam spring that urges the body in the forward movement direction, and the cam is driven by an axial reaction force that acts from the pin through the cam groove in the forward rotation of the stepping motor after the valve body for the safety valve reaches the valve opening position. When the body moves from a predetermined position in the recovery direction against the urging force of the cam spring, when the ignition operation is performed by the point fire extinguishing operation member, the stepping motor is rotated in the normal direction to rotate the valve body for the safety valve. By pushing the valve to the valve opening position and energizing the electromagnet with the stepping motor rotating in the normal direction until the cam body moves from the predetermined position in the recovery direction after the safety valve valve body arrives at the valve opening position. To suck and hold the valve body for the safety valve at the valve opening position, to reverse the stepping motor to return the cam body to the predetermined position, and to open the main valve with the energization to the stepping motor stopped. , The reversal of the stepping motor is restarted in order, and the operation of the ignition means is started at a predetermined time before or after the opening of the main valve.

According to the present invention, when the valve body for a safety valve is attracted and held at the valve opening position, the stepping motor is operated from a predetermined position where the cam body is stopped by the cam stopper until it moves in the recovery direction against the urging force of the cam spring. Even if the vehicle rotates in the normal direction, when the main valve is opened after the energization of the stepping motor is stopped, the cam body is returned to the predetermined position, so that the stepping motor is in the reverse direction due to the urging force of the cam spring. Torque does not work. Therefore, by stopping the energization of the stepping motor when the main valve is opened, slippage does not occur in the motor, and an error in adjusting the gas flow rate by the flow rate control valve due to this slippage can be prevented.

The figure which shows the gas circuit of the cooking apparatus of embodiment of this invention. The cut side view of the main valve provided in the cooking apparatus of embodiment. The cut side view of the gas valve device provided in the cooking apparatus of embodiment. An exploded perspective view of an interlocking mechanism included in the gas valve device of FIG. (A) (b) (c) A cut side view of a main part showing the operation of the gas valve device of FIG.

With reference to FIG. 1, reference numeral 1 denotes a burner for heating an object to be heated provided in the cooking apparatus according to the embodiment of the present invention. This heating cooker is operated to ignite and extinguish the ignition means for igniting the burner 1, specifically, the igniter 3 for performing spark discharge at the ignition electrode 2 attached to the burner 1, and the burner 1. It is provided with a point fire extinguishing button 4 which is a fire extinguishing operation member and is arranged so as to appear and disappear in an operation panel portion (not shown). The point fire extinguishing button 4 is a push-push type, and is displaced to the ignition position protruding from the operation panel portion by once pushing in from the fire extinguishing position immersed in the operation panel portion and releasing the push-in, and in this state, for adjusting the thermal power. It can be rotated. The ignition means may be other than the igniter 3.

The cooking cooker further comprises a main valve 6 interposed in the gas supply path 5 to the burner 1, a gas valve device 7 interposed in the gas supply path 5 in series with the main valve 6, and a microcomputer. It includes a controller 8. The operation signal of the point fire extinguishing button 4 is input to the controller 8 together with the signal from the flame detection element of the burner 1 (not shown). Then, the igniter 3, the main valve 6, and the gas valve device 7 are controlled by the controller 8.

With reference to FIG. 2, the main valve 6 has a valve casing 61 having a gas inflow port 61a, a gas outflow port 61b, and a valve seat 61c provided at an opening location of the gas outflow port 61b, and the inside of the valve casing 61. A valve body 63 that is arranged so as to face the valve seat 61c and is urged by a spring 62 in the closing direction that sits on the valve seat 61c, an electromagnet 65 that faces the suction piece 64 connected to the valve body 63, and an electromagnet. It is composed of an electric solenoid valve including a motor 67 that drives 65 in the opening / closing direction of the valve body 63 via a feed screw mechanism 66. When opening the main valve 6, first, the motor 67 moves the electromagnet 65 in the closing direction (lower part of FIG. 2) to bring it into contact with the suction piece 64 (state shown in FIG. 2), and then the electromagnet 65. The suction piece 64 is attracted by energization, and in this state, the electromagnet 65 is moved in the opening direction (upper part of FIG. 2) by the motor 67 to separate the valve body 63 from the valve seat 61c. When closing the main valve 6, the energization of the electromagnet 65 is stopped, and the valve body 63 is returned to the valve closing position seated on the valve seat 61c by the urging force of the spring 62.

With reference to FIG. 3, the gas valve device 7 is provided in a tubular valve casing 71, an electromagnetic safety valve 72 arranged in an axially one-sided portion in the valve casing 71, and an axially opposite portion in the valve casing 71. , The flow control valve 73 arranged in series with the electromagnetic safety valve 72, the stepping motor 74 mounted on the outer end of the box 711 attached to the other end of the valve casing 71 in the axial direction, and the stepping motor 74 mounted in the valve casing 71 from the other axial direction. It includes an operating rod 76 that is inserted and driven axially via an interlocking mechanism 75 by a stepping motor 74, and a valve seat member 77 that is movably provided in the valve casing 71 in the axial direction. In the following description, one in the axial direction is referred to as a forward movement direction, and the other in the axial direction is referred to as a return direction.

The valve casing 71 is provided with a gas inflow port 71a located on the upstream side of the electromagnetic safety valve 72 and a gas outflow port 71b located on the downstream side of the flow rate control valve 73. Then, when the electromagnetic safety valve 72 is opened, gas flows from the gas inflow port 71a to the gas outflow port 71b, and the gas is supplied to the burner 1.

The electromagnetic safety valve 72 reactivates the safety valve valve seat 721 provided on the valve seat member 77 so as to face the forward movement direction, the safety valve valve body 722 facing the safety valve valve seat 721, and the safety valve valve body 722. A valve spring 723 that is urged in the direction to be seated on the safety valve valve seat 721, an suction piece 724 that is connected to the safety valve valve body 722 via a valve shaft 722a that extends in the forward direction, and an electromagnet facing the suction piece 724. It has a 725 and. Then, the safety valve valve body 722 is opened by energizing the electromagnet 725 in a state where the suction piece 724 is pushed against the valve spring 723 to the valve opening position where the suction piece 724 is in contact with the electromagnet 725. It is designed to be sucked and held at the position. When a misfire is detected by the flame detection element or when a fire extinguishing operation is performed by pushing the point fire extinguishing button 4 from the ignition position to return it to the fire extinguishing position, the energization of the electromagnet 725 is stopped and the safety valve valve body 722 is stopped. Is returned to the valve closing position seated on the safety valve valve seat 721 by the valve spring 723, and the electromagnetic safety valve 72 is closed.

The inside of the valve casing 71 is composed of a protrusion formed on the inner surface of the valve casing 71 that stops the movement of the valve seat member 77 in the recovery direction at a predetermined recovery end position where the safety valve valve body 722 can be seated. A valve seat stopper 771 and a valve seat spring 772 that urges the valve seat member 77 in the recovery direction and elastically holds the valve seat member 77 at the recovery end position are provided. Further, a bellofram 773 is provided to prevent gas from flowing to the outside of the valve seat member 77. Since the valve seat member 77 is pressed in the recovery direction by the gas pressure from the gas inflow port 71a, the valve seat spring 772 can be omitted.

The flow rate control valve 73 is a control valve valve seat 731 formed on the valve seat member 77 so as to face the return direction, and a control valve valve 73 fixed to an operation rod 76 so as to face the control valve valve seat 731. It has a body 732 and. The control valve valve body 732 is inserted into the control valve valve seat 731 and the valve hole 731a from the return direction so as to close the valve hole 731a opened in the control valve valve seat 731. It has a possible needle portion 732b and a bypass passage 732c that constantly communicates with the upstream side and the downstream side of the flow rate control valve 73. In the present embodiment, the control valve valve body 732 is integrally formed with the operation rod 76, but the control valve valve body 732 may be separated from the operation rod 76 and attached to the operation rod 76. good.

With reference to FIG. 4, the interlocking mechanism 75 engages with a cylindrical cam body 754 concentric with the operation rod 76 rotationally driven by the stepping motor 74 and a spiral cam groove 754a formed in the cam body 754. The operating rod 76 has a pin 755 fixed to the operating rod 76, and the operating rod 76 moves in the forward and reverse directions by the axial thrust acting from the cam groove 754a through the pin 755 in the forward rotation and the reverse rotation of the cam body 754. It is composed of a cam mechanism that moves to and. Between the stepping motor 74 and the cam body 754, a reduction gear train 751 incorporated in the motor case, a rotary shaft 752 on the output side of the reduction gear train 751, and a connection connecting the rotary shaft 752 and the cam body 754. A child 753 is provided. The connector 753 has a non-circular hole 753a that fits into the rotating shaft 752 having a non-circular cross section, and rotates together with the rotating shaft 752. Further, the connector 753 is provided with a projecting piece portion 753b that engages with a notch portion 754b formed at the end of the cam body 754 in the recovery direction and transmits a rotational force. A guide cylinder 756 extending in the recovery direction from the valve casing 71 is inserted into the cam body 754. A long hole 756a long in the axial direction is formed in the guide cylinder 756, and a pin 755 is slidably engaged with the long hole 756a in the axial direction.

When the ignition operation is performed by pushing the point fire extinguishing button 12 from the fire extinguishing position and projecting it to the ignition position, the stepping motor 74 is rotated in the normal direction. According to this, the operation rod 76 moves in the forward movement direction via the interlocking mechanism 75, and first, the closing valve portion 732a of the control valve valve body 732 is located at the return end position where it is stopped by the valve seat stopper 771. The valve seat member 77 comes into contact with the control valve valve seat 731, and thereafter, the valve seat member 77 is pushed by the control valve valve body 732 and moves in the forward movement direction, and the safety valve valve body passes through the valve seat member 77. The 722 is pushed to the valve opening position (state shown in FIG. 5A). In this state, the electromagnet 725 is energized to attract and hold the safety valve valve body 722 at the valve opening position. After that, after opening the main valve 6, the stepping motor 74 is reversed to move the operating rod 76 in the recovery direction, and the ignition means is operated, that is, the igniter 3 is energized. At this time, the valve seat member 77 moves in the recovery direction following the operation rod 76 to the return end position, and separates from the safety valve valve body 722 in which the safety valve valve seat 721 is attracted and held at the valve opening position. , The electromagnetic safety valve 72 is opened, and the gas supply to the burner 1 is started. After that, the control valve valve body 732 is further moved in the recovery direction with respect to the valve seat member 77 stopped at the return end position, the block valve portion 732a is separated from the control valve valve seat 731, and the gas flow rate is gradually increased. Increase and ignite burner 1. After the burner is ignited, the valve body 732 for the control valve moves in the forward movement direction, and the closing valve portion 732a is attached to the valve seat 731 for the control valve in a predetermined stroke range, that is, with the valve seat member 77 at the return end position. The range between the seating position (state in FIG. 5B) and the position immediately before the safety valve valve seat 721 abuts on the safety valve valve body 722 in the valve opening position (state in FIG. 5C). When present, the gas flows only through the bypass passage 732c and is maintained in a state where the gas flow rate is minimized.

It is difficult to control the stepping motor 74 at the moment when the valve body 722 for the safety valve reaches the valve opening position, that is, at the moment when the suction piece 724 comes into contact with the electromagnet 725. Therefore, when the operation rod 76 is pushed in the forward movement direction via the interlocking mechanism 75 by the further forward rotation of the stepping motor 74 after the valve body 722 for the safety valve reaches the valve opening position, the suction piece 724 and the electromagnet 725 An excessive force is applied to the abutting portion of the suction piece 724, and the suction piece 724 may be damaged, resulting in poor suction.

Therefore, in the present embodiment, the cam body 754 is made movable in the axial direction, and the cam body 754 is stopped from moving in the forward direction at a predetermined position. A cam spring 758 that urges the cam body 754 in the forward movement direction is provided. Then, in the forward rotation of the stepping motor 74 after the valve body 722 for the safety valve reaches the valve opening position, the cam body 754 is attached with the cam spring 758 by the axial reaction force acting from the pin 755 through the cam groove 754a. I try to move in the direction of recovery against the forces. According to this, even if the stepping motor 74 is further rotated in the normal direction after the safety valve valve body 722 reaches the valve opening position, the pressing force acting on the operating rod 76 in the forward direction is less than the urging force of the cam spring 758. It can be suppressed. Therefore, an excessive force is not applied to the contact portion between the suction piece 724 and the electromagnet 725, and it is possible to prevent the suction piece 724 from being scratched and causing a suction failure. Before the safety valve valve body 722 reaches the valve opening position, the cam spring 758 is provided so that the cam body 754 does not move in the recovery direction due to the urging force of the valve spring 723 and the valve seat spring 772. The urging force is set to be slightly larger than the resultant force of the urging forces of the valve spring 723 and the valve seat spring 772.

By the way, if the stepping motor 74 is energized when the main valve 6 is opened after the safety valve valve body 722 is attracted to the valve opening position by energizing the electromagnet 725, the power consumption becomes large and the power supply battery The voltage drops and the battery life is shortened. In this case, the stepping motor 74 is rotated in the normal direction until the cam body 754 moves in the reverse direction against the urging force of the cam spring 758 from the predetermined position stopped by the cam stopper 757, and the electromagnet 725 is energized for the safety valve. It is conceivable to suck and hold the valve body 722 at the valve opening position, stop the energization of the stepping motor 74 in this state, and open the main valve 6. However, when the cam body 754 is moved from the predetermined position in the recovery direction, the rotational force in the reverse direction acts on the stepping motor 74 through the cam groove 754a that abuts on the pin 755 due to the urging force of the cam spring 758. When the rotational force exceeds the detent torque, slippage occurs in the stepping motor 74. Then, the correlation between the rotational phase of the stepping motor 74 and the axial position of the operating rod 76 is deviated, and an error in adjusting the gas flow rate by the flow rate adjusting valve 73 occurs.

Therefore, in the present embodiment, when the ignition operation is performed by the point fire extinguishing button 4, the stepping motor 74 is rotated in the normal direction to push the safety valve valve body 722 to the valve opening position as described above, and the safety valve is used. After the valve body 722 arrives at the valve opening position, the safety valve valve is energized by energizing the electromagnet 725 with the stepping motor 74 rotating in the normal direction until the cam body 754 is stopped by the cam stopper 757 and moves in the recovery direction. The body 722 is attracted and held at the valve opening position, the stepping motor 74 is reversed to return the cam body 754 to a predetermined position, and the main valve 6 is opened with the stepping motor 74 stopped energized. That, and the reversal of the stepping motor 74 is restarted, and the igniter 3 is energized in order.

According to this, when the main valve 6 is opened while the energization of the stepping motor 74 is stopped, the cam body 754 is returned to the predetermined position stopped by the cam stopper 757, so that the cam spring is applied to the stepping motor 74. The torque in the reverse direction due to the priming force of 758 does not act. Therefore, by stopping the energization of the stepping motor 74 when the main valve 6 is opened, slippage does not occur in the motor 74, and an error in adjusting the gas flow rate by the flow rate control valve 73 due to this slippage is prevented. be able to.

It is difficult to control the reversal of the stepping motor 74 before opening the main valve 6 at the moment when the cam body 754 returns to a predetermined position stopped by the cam stopper 757. Therefore, the stepping motor 74 may be reversed to some extent after the cam body 754 is returned to the predetermined position, and the reverse rotation of the stepping motor 74 may be stopped when the state close to FIG. 5C is reached.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited thereto. For example, in the above embodiment, after the main valve 6 is opened, the igniter 3 is energized at the same time as the stepping motor 74 is restarted in reverse rotation, that is, the ignition means is started to operate. It is also possible to start the operation of the ignition means when the opening degree of the flow rate control valve 73 increases to some extent due to the reversal of the stepping motor 74, or to start the operation of the ignition means before opening the main valve 6, which is necessary. May start the operation of the ignition means at a predetermined time before or after the opening of the main valve 6. Further, in the above embodiment, the main valve 6 is composed of an electric solenoid valve, but the main valve 6 may be formed by a normal solenoid valve. Further, a gas stove is mentioned as a typical example of the cooking cooker of the present invention, but the present invention can be similarly applied to a cooking cooker other than the gas stove.

1 ... Burner, 3 ... Ignite (ignition means), 4 ... Point fire extinguishing button (Point fire extinguishing operation member), 5 ... Gas supply path, 6 ... Main valve, 7 ... Gas valve device, 71 ... Valve casing, 72 ... Electromagnetic safety valve , 721 ... Safety valve valve seat, 722 ... Safety valve valve body, 722a ... Valve shaft, 723 ... Valve spring, 724 ... Adsorption piece, 725 ... Electromagnet, 73 ... Flow control valve, 731 ... Control valve valve seat, 732 ... Valve body for control valve, 74 ... Stepping motor, 75 ... Interlocking mechanism, 754 ... Cam body, 754a ... Cam groove, 755 ... Pin, 757 ... Cam stopper, 758 ... Cam spring, 76 ... Operation rod, 77 ... Valve seat member, 771 … Valve seat stopper.

Claims (1)

A burner that heats the food to be cooked, an ignition means that ignites the burner, a point fire extinguishing operating member that is operated to ignite and extinguish the burner, a main valve that is interposed in the gas supply path to the burner, and gas. A cooker equipped with a main valve and a gas valve device installed in series in the supply path.
The gas valve device is provided with an electromagnetic safety valve, a flow control valve, an operation rod driven axially by a stepping motor via an interlocking mechanism, and a valve seat member movable in the axial direction in the valve casing. , One in the axial direction is the forward direction, and the other in the axial direction is the return direction.
The electromagnetic safety valve urges the safety valve valve seat provided on the valve seat member so as to face the forward movement direction, the safety valve valve body facing the safety valve valve seat, and the safety valve valve body in the recovery direction. It is equipped with a valve spring that sits on the valve seat for the safety valve, an suction piece that is connected to the valve body for the safety valve via a valve shaft that extends in the forward direction, and an electromagnet that faces the suction piece. The flow control valve is a valve seat member. It is provided with a valve seat for a control valve provided so as to face the recovery direction and a valve body for a control valve fixed to an operation rod so as to face the valve seat for the control valve.
A valve seat stopper is provided in the valve casing to stop the movement of the valve seat member in the recovery direction at a predetermined recovery end position where the safety valve valve body can be seated on the safety valve valve seat, and the stepping motor is rotated in the normal direction. By moving the operation rod in the forward movement direction, the valve body for the control valve is brought into contact with the valve seat for the control valve, and the valve seat member is pushed in the forward movement direction from the return end position for the safety valve. By abutting the valve seat on the valve body for the safety valve and energizing the electromagnet while pushing the valve body for the safety valve against the urging force of the valve spring to the valve opening position where the suction piece abuts on the electromagnet. The valve body for the safety valve is attracted and held at the valve opening position, and then the stepping motor is reversed to move the operation rod in the recovery direction, thereby moving the valve seat member in the recovery direction and opening the valve seat for the safety valve. Separate the safety valve valve body that is attracted and held at the valve position so that the electromagnetic safety valve is opened.
The interlocking mechanism has a tubular cam body concentric with the operation rod, which is rotationally driven by a stepping motor, and a pin fixed to the operation rod, which engages with a spiral cam groove formed in the cam body. The cam body is composed of a cam mechanism that moves the operation rod in the forward and backward directions by the axial thrust that acts from the cam groove through the pin in the forward and reverse rotation of the body, and the cam body is in the axial direction. The safety valve valve body reaches the valve opening position with a cam stopper that is freely movable and stops the movement of the cam body in the forward movement direction at a predetermined position and a cam spring that urges the cam body in the forward movement direction. In the case where the cam body moves from a predetermined position in the recovery direction against the urging force of the cam spring due to the axial reaction force acting from the pin through the cam groove in the forward rotation of the stepping motor. ,
When the ignition operation is performed by the point fire extinguishing operation member, the stepping motor is rotated in the normal direction to push the safety valve valve body to the valve opening position, and the cam body after the safety valve valve body arrives at the valve opening position. The safety valve valve body is attracted and held at the valve opening position by energizing the electromagnet while the stepping motor is rotated in the normal direction until the stepping motor moves from the predetermined position to the return direction, and the stepping motor is reversed to specify the cam body. Returning to the position, opening the main valve with the energization of the stepping motor stopped, and restarting the reversal of the stepping motor are performed in order, before or after opening the main valve. A heating cooker characterized in that the operation of the ignition means is started at a predetermined time.

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